"But, you know, just because you say you've done it is no reason that we should believe you have," Barker said.
"Not believe me!" she said, her voice rising. "Do people usually come and con-fess to murdering people when they didn't?"
"Oh, quite often," said Barker.
She sat in surprised silence, her bright, expressionless dark eyes darting swiftly from one face to the other. Barker raised a comical eyebrow at the still silent Grant, but Grant hardly noticed him. He came from behind the desk as if loosed suddenly from a spell that had held him motionless, and came up to the woman.
"Mrs. Wallis," he said, "will you take off your gloves a moment?"
"Come now, that's a bit more sensible," she said, as she drew off her black cotton gloves. "I know what you're looking for, but it's nearly gone now."
She held out her left hand, gloveless, to him. On the side of her first finger, healed but still visible in the rough skin of her hard-worked hand, was the mark of a jagged scar. Grant expelled a long breath, and Barker came over and bent to examine the woman's hand.
"But, Mrs. Wallis," he said, "why should you want to kill Sorrell?"
"Never you mind," she said. "I killed 'im, and that's enough."
"I'm afraid it isn't," Barker said. "The fact that you have a small scar on your finger is no proof at all that you had anything to do with Sorrell's death."